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In general, yes, immigration during 1830s to 1840s was vital to the industrialization of America, since it was mostly immigrants who first sought employment in the factories that were an essential element of industrialization.
Answer:
The Antiballistic Missile Treaty was created because the countries involved needed limitations on the ways that the they could use anti-ballistic missile systems. The treaty was signed by two countries: the United States and the Soviet Union. In 2002, the United States withdrew from the treaty since it was the only remaining party that followed the treaty. After the United States withdrew from the treaty, it was terminated.
A unitary system of government is a monarchy. Which means that the country is ruled by one person or a group of people. An example of a unitary system is a country that is run by a royal family, that consists of kings and queens.
A federal system is a system is a system of government that is run but not ruled by a government that has many different political parties and many different people. The United States is an example of a federal system.