In addition to squash and beans what other food crop did the

B. Maize (Maize is another word for Corn)

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i would think it's industries and hydroelectric power

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.