The US has a democracy i.e. the government represents the people. If you're a citizen on the US you can protest/resist anything you want, apart from in very extreme circumstances.
Yes It is unclear what is meant by "Palestinian Involvement". The Jewish Militias of Palestine, like the Haganah and Palmach (who at that time were called Palestinian Jews) actively contributed to the British War Effort against the Nazis. The Palestinian Arabs did not assist the British War effort, although they were involved in supporting the Grand Mufti of Jerusalem who was a close friend of the Nazis and Fascists in Europe.
which war
The answer depends upon whether the war is just or not. Sometimes war is unavoidable and necessary. If the war is just and one protests against it that person is unpatriotic. However, a person might still value religious or moral or personal views higher than patriatism. Protesting unjust wars is not unpatriotic. Clearly the key is to know what is just and unjust. I would submit that there are clear cut cases of just wars such as WWII. Unjust wars are usually much more difficult to judge, especially at the time that the conflict took place.
Some did so for reasons of conscience, some lacked patriotism and a small yet vocal minority preached an isolationist position.
Because they believed theVietnamWar was a civil war , which it was, and that our involvement was unnecessary.
Britain's involvement in the war led to the involvement of Canada, because it's a Commonwealth Nation.
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The involvement of new Mexicos in the Spanish American war showed solidarity.
The Chinese Army was actively fighting UN (United Nations) forces, while the Soviets were equipping the Chinese and the North Koreans with weaponry.
"ESCALATION" of the war.
It is where the War began.
Increased involvement in the war