I’ll give brainlist to whoever gets it correct What effect did the Columbian Exchange have on slavery in America?

A. Slavery decreased because the introduction of horses decreased
the need for manpower.

B. Slavery increased because workers were needed to grow
sugarcane.

C. Slavery increased because workers were needed to run machines
in factories.

D. Slavery decreased because the introduction of European diseases
decreased the slave population.

"if i have seen farther than others," said newton, "it is because i have stood on the shoulders of giants." who were the giants to whom newton was referring? could this be said of any scientific accomplishment? explain.

Interest groups representing businesses and investors are often among the most successful lobbying groups for all of the following reasons, except a. such groups have the financial resources to mount sustained campaigns on their own behalf b. these groups' members contribute heavily to many legislators' campaigns and in so doing gain greater access to legislators c. these groups have often been in existence for decades, allowing them to both master the legislative system and develop close ties with legislators d. the members of these groups make up the majority of voters in many districts

In the period from 1860 to 1890, which experience was shared by most native americans living in western states?