The absence of a uniform tariff rate benefited British exports to America.
State of the Union allows the Congress and president to collaborate because it let the Congress know how the country is faring.
The State of the Union refers to an annual message of the U.S. President at the start of each calendar-year that aims to delivers the his idea and views on the country's condition to the U.S. Congress.
Furthermore, the State of the Union gives room for more suggestions for new laws and policies.
Hence, the State of the Union allows the Congress and president to collaborate because it let them (Congress) know how the country is faring.
Therefore, the Option D is correct.
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River valley civilization or river culture is an agricultural nation or civilization situated beside and drawing sustenance from a river. A "civilization" means a society with large permanent settlements featuring urban development, social stratification, specialization of labour, centralized organization, and written or other formal means of communication. A river gives the inhabitants a reliable source of water for drinking and agriculture. Additional benefits include fishing, fertile soil due to annual flooding, and ease of transportation. The first great civilizations, such as those in Mesopotamia and Egypt, all grew up in river
If you define American as a person who lives in America - then the first Americans were the native Americans who traveled from Asia many thousands years ago and they settled the whole American continent