During the columbian exchange, natives of the americas were introduced to

potatoes.

corn.

cattle.

beavers.

The correct answer is: Cattle

With the Columbian exchange Europeans introduced some things to America and took some others that were unknown to them.

Potato and corn were well known foods to the Americans, the Aztec's main food was corn and the Inca's one potato.  

One of the main species of beaver has it's origin in America, the Castor Canadensis whose ancestor migrated from Asia about 7.5 million years ago.

Therefore, cattle is correct. When the spanish people arrived America they brought horses and pigs in their secound journey, unknown for the natives. As an example, the Aztecs often believed that a Spanish riding a horse was a two headed creature. Later on cows were also introduced.

the second significant cause of the great migration was the desire of black southerners to escape segregation, known euphemistically as jim crow. rural african american southerners believed that segregation - and racism and prejudice against blacks - was significantly less intense in the north.

1. the townshend acts of 1767 “threaten the country with poverty and ruin.”

at a town meeting held at faneuil hall in boston on october 28, 1767, boston freeholders and residents discussed the implications of the brutal townshend acts levied against the colonists. the townshend acts were a set of four acts passed by the british parliament in the summer of 1767 in order to generate revenue for the crown (through duties on goods such as lead, glass, paper, and tea) as well as exert british control over the increasingly rebellious colonists.

during the oct. 28 meeting, the bostonians found:

the excessive use of foreign superfluities is the chief cause of the present distressed state of this town, as it is thereby drained of its money: which misfortune is likely to be increased by means of the late additional burthens and impositions on the trade of the province, which threaten the country with poverty and ruin.

as a result, the citizens unanimously voted to boycott all british-made goods.