What was used to increase wheat production?

Howe's harvester

Explanation:

Threshing machine (or thresher), a machine that first divides the crest of a stock of seed from the hay, and then moreover separates the grain from the rest of the top.

Howe's thresher formed raw materials inexpensive for textile production.

the answer for 3 is b and the answer for 4 is d

i belive the continental association was created to boycott all contact with british goods.

i also belive it was in december 1, 1774