They got to prove their worth and that they were patriotic.
The “privileges and immunities clause” contained in Article IV, Section 2, provides, “The Citizens of each State shall be entitled to all Privileges and Immunities of Citizens of several states.” This limits the ability of states to favor their own citizens and discriminate against out-of-state citizens with respect.
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The First World War destroyed empires, created numerous new nation-states, encouraged independence movements in Europe's colonies, forced the United States to become a world power and led directly to Soviet communism and the rise of Hitler
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