1 is the spread of slavery, but I'm not sure about 2
<span>The first human experiments with plant cultivation begin in the New World during the early post-Pleistocene period. Squash is one of the earliest crops. This agricultural development process, which continues slowly over thousands of years.</span>
C. open primary
an open primary means dems and republicans can both vote
The working middle class of America saw an increased standard of living in the post era of WWII. I believe that is the answer you are looking for.
