Answer:
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The relationship with the Soviet Union changed because of rivalries over ideology and borders.
Relationship with the United States improved because the U.S. saw China as a useful partner in its conflict with the Soviet Union.
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It lasted around 600 years. The Louisiana Caddo wanted to moved southwest to live with others of the tribe in Texas.
A patent is an exclusive right granted by country to allow the inventor to exclude others from making, using or selling their invention in that country during the life of the patent.
The answers would be 1 and 2