I think it is B.) Caravan
It promoted the (relatively) rapid diffusion of immigrants, language, and domesticated crops and animals. Those factors are examined in excellent detail in Jared Diamond's book, "Germ, Guns and Steel" which I highly recommend for anyone studying the development of world cultures. It's a long read, but well worth it.
The slavery has been a human practice for several millenniums, and it was practiced all over the world.
Explanation:
The slavery is something that the humans from all over the world were practicing unfortunately. This practice continued for millenniums, and it only stopped relatively recently. the period between the 13th and 17th century is a very important one when it comes to slavery, as it spread out much more and started to be practiced not just locally, but regionally and even between different continents.
East Africa and West Africa were using lot of slaves, and they were mostly enslaving people that were conquered and from weaker tribes on the outskirts. They were forcing them to work in mining, or to lift and carry trade goods. Later, they started to sell slaves to the Europeans as they saw a great economic opportunity.
In Europe itself, the slavery was mostly found in the Balkan Peninsula, were the Ottomans were forcing the people to work for them, and took large percentage of their crops and money. The European nations that became imperial powers were buying slaves from Africa, and they moved them into the Americas, thus made it international slavery, establishing the Atlantic slave trade.
Southwest Asia in this period also had lot of slaves, most of which were people that didn't wanted to accept the Islam, so people of different religious backgrounds, of numerous ethnic and racial groups, that were caught, were enslaved and treated as animals.
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Answer:
Option B, It caused the United States to form a military alliance with countries from Western Europe
Explanation:
The main ideology of the American foreign policy was Truman Doctrine devised by President Harry S. Truman in 1949. The agenda of the policy was to counter the geopolitical expansion of soviet during the cold war.
Hence, a military alliance was formed to restrict the European countries from poaching into others territory.
This alliance exists even today
Hence, option B is correct
