What two factors were most responsible for the end of the long cattle drives?
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A combination of factors brought an end to the cattle kingdom in the 1880s. The profitability of the industry encouraged ranchers to increase the size of their herds, which led to both overgrazing (the range could not support the number of cattle) and overproduction.

Explanation:

a, c, & d are correct:

they wanted lands to settle the extra population.

they wanted new markets for english goods.

they wanted to avoid civil war.

the  seven  days  battles  were  a series of seven battles over seven  days from june 25 to july 1, 1862, near richmond, virginia,  during  the american civil war. the  seven  days ended with mcclellan's army in relative safety next to the james river, having suffered almost 16,000 casualtiesduring  the retreat.