Answer:
Slavery
Explanation:The United States became a continental nation with the purchase of Louisiana from France in 1803 and the settlement of the lands beyond the Appalachian Mountains. Westward expansion fueled conflict with Native populations and led to their forced removal. By 1820, 2 million Americans lived west of the Appalachians, out of a total national population of 10 million. The regional cultures that had developed along the Atlantic Coast—New England, Middle Atlantic, Chesapeake, and Carolinas—were transplanted into the Old Northwest (Ohio, Indiana, Illinois, Michigan, and Wisconsin) and the Old Southwest (Arkansas, Kentucky, Louisiana, Missouri, Tennessee, and Texas). But although Americans had begun to identify themselves as a nation, they were divided by sectional interests that deepened with rapid industrialization and the question of slavery.
Answer: 
Explanation:
Given
A Planet is moving at a rate of 3 cm/year
distance between planets is 1500 km
and 1 km=1000 m
1 m=100 cm
No. of years required to cover 1500 km=
I believe the answer is the first one.
The Second World War (WW2) (1 September 1939 September 2, 1945) - War of the two world military-political coalitions, which became the largest armed conflict in history. It was attended by 62 of the 73 States that existed at the time (80% of the world population). Battles were fought on the territory of three continents and in the waters of the four oceans. This is the only conflict in which it was to use nuclear weapons.
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Answer:
I do not see your maps. Can you attach the maps, (an image of them) please-So I can help you?
