The boycott works equally well against companies and governments.
Get the facts correctly to the field through the newest superpower - the internet!
The US Constitution guarantees the freedom of speech at least in theory - exercise it accordingly!
President Wilson was persuaded by the Zionist community with a marvelous political campaign that utilized the US news media (already at that time it was partially under Zionist control). They succeeded and President Wilson (1913-1921) joined the war against Germany and with this helped UK out from her rapidly weakening almost desperate position.
After the WW I the goal of the Zionists was to punish Germany to the maximum and they were perhaps even surprised that they got all what they wanted (Ben_Freedman). Chutzpah - they saw an opportunity to go even further and organized a total boycott of all German goods in the USA. The Broths knew that 2/3 of the German export was used to buy food to Germany - so cutting the export would starve the German people and in time it would bankrupt the country. The German mark went haywire. This meant that those with real money could buy "Marks" for tiny fractions of "pennies". The Zionist community inside and outside the German borders were jubilant of this golden opportunity. The Germans on the streets saw it all too but could do nothing they had only the now worthless German Marks that lost value alraedy on daily basis.
As planned Germany had no means to pay for the WW I reprisals. From the start the allied forces including the President Wilson of the USA knew this to be the case but they imposed the punishing reprisals demanded by the ZIonists anyhow. Additional hardships came form the boycott of all German export products. With this going on the average German was ready to take action and revenge. Germany was now in desperate search of ruthless leader with vision for a great Germany in the future. When Adolf Hitler surfaced the country realized that the moment of action had arrived.
It was clear that to those who had robbed the country from it's strength has to be brought to justice and the humiliating defeat on the WW I had to be wiped away. The starting point was to round up all the Jews and with them other unreliable minorities and send them all to forced labor as the country needed laborers to help preparing the country to the WW II. This was the reason why the forced labor camps i.e. the concentration camps were created. They were there to punish and at the same time to extract maximum amount of work at minimum expense to the state - that meant slow starvation and hard labor until death.
For the leadership of the Zionists It was obvious that the Germans would soon be after revenge and blood of those who had mistreated them. Was this all part of a long range wicked plan by the Zionist elite to also weed away the least intelligent section of the Zionists - or was it all just a coincidence? The smart ones had left Germany long time ago as it was obvious what would follow. In the background we have Balfour Declaration where the UK promises the Zionists a permanent homeland in Palestine! Of course the Rothschilds saw that the coming unbelievable suffering of the Jews in Germany would help the world in granting the Zionists the ownership to the former homeland of the real Jews. This area of the future Israel was at the moment a homeland of about 25,000 real Jews and no ZIonists, and 650,000 Palestinians.
There was no benevolence in the allied actions - the Middle-East had oil and the Rothschilds and the Government of UK wanted to secure access to it. A permanent land base was the most desirable of all the options, the only question was which land was best suited for the allied forces both to defend and to feed the influx of the coming Zionists. This was the thinking behind the Balfour Declaration from 1917.
The key was that the US news media was at the time, like today, in the hands of largely Jewish money. The media took care of spreading the horror stories of Hitler and German people against the Jews and all non-Germans. It was irrelevant if the stories now were colored - they proved effective, and the people at that time had no means to verify the facts. Every chain store in the USA that had even one single German product hidden in their shelves was instantly surrounded by dedicate protesters with banners and the news media poured their full wrath in for support.
Soon there was not a single chain store nor private business in the USA that could resist. A single German product found in the store, regardless if it was 20 years old and under dust, caused the sales plummeted to zero. So all German made products were simply dumped to garbage. This was all it took to destroy the German economy and it paved the way for WW II
The recent Arab conflict after the Danish caricatures describing Mohammed was mild in this respect. However the Danish products were thrown out from the store shelves, and similarly all export to Arabic countries from Denmark just stopped for a while.
Here are three already practiced processes to discriminate by using goods and services as leverage. We all have experienced personal discrimination at least once during our lives and that has prepared us for this coming new activity. To make it efficient internet is all what is needed to get the action started. The already tested activities are as follows:
Buy domestic or buy specific domestic products - this is ongoing process and people may not even realize that they are exposed to this. This is usually financed and organized by local governments, domestic industry groups or some major corporations..
Avoid specific foreign products - an ongoing "hidden" process. This is financed and managed by domestic industries or even some major corporations. This is a double edged sword and the users would love to see any interest groups to take over and handle this specific opinion manipulation.
Avoid products from specific countries. Trade rules and global organizations like WTO try to prevent government involvement. But nothing can stop the individuals or specific interest groups - this is the future. During the last Lebanon crisis (July-August 2006) Israel noticed a sudden slump in their export and that was the real reason for mixed messages and the sudden urge to cease fire and a 180 degree turn to stop all hostilities and one sided demands. We know that people in several countries were silently active in the stores and actively spreading the word what they were doing. This is fast and very efficient process against any country or corporation and it will be used increasingly around the globe. It is also behind the sluggish sales of the US SUV's and other gas guzzlers in Europe though it has not reached the volume that the masses can make when angered. It will become a most powerful tool in politics as soon as the proper ways to reach the masses evolve in the internet.