Answer:
{Hello Kirito here! i believe this is the answer-}
Because they believed in the cause of American Revolution. They believed that people have their natural rights, and that one of them is liberty. They fought in America because they believed that people in their countries they also should also upheld similar ideas and movements. I think they also did it because they believed that rights of people are above the rights of individuals. That is why they fought for Americans as for their own people.
Lafayette, Pulaski and many other revolutionist who fought in the American Revolution continued spreading the ideas of revolution even later. They truly believed that inequality should be removed, and that sometimes the revolution is the only solution.
Explanation:
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We hold these Truths to be self-evident, that all Men are created equal, that they are endowed by their Creator with certain unalienable Rights, that among these are Life, Liberty, and the Pursuit of Happiness—That to secure these Rights, Governments are instituted among Men, deriving their just Powers from the Consent of the Governed, that whenever any Form of Government becomes destructive of these Ends it is the Right of the People to alter or to abolish it, and to institute new Government, laying its Foundation on such Principles, and organizing its Powers in such Form, as to them shall seem most likely to effect their Safety and Happiness.
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Both Napoleon III and Otto von Bismarck allowed room for liberal or popular policies that would help them strengthen the government's standing with the people.
Charles-Louis-Napoleon Bonaparte was president of France from 1848-1852, and then Emperor of the French from 1852-1870. From 1852-1860 he ruled in strongly authoritarian fashion. But during the period known as the "liberal empire" (1860-1870), in order to shore up popularity for his government, he allowed the legislature more of a role in governing, relaxed censorship of the press, and restored freedom of assembly. All of these were liberal measures, but politically realistic moves to keep Napoleon III from losing standing with the populace.
Otto von Bismarck, Chancellor of the German Empire from 1871-1890, was not himself a socialist. But he is famed for introducing the first government programs for social welfare in the Western world. Socialism had the potential of fomenting revolution among the working class in Germany. Employing some government measures to respond to the needs and issues of ordinary German workers was a Realpolitik measure.
Yes part of the taxes do go to newcomers