Public health and sanitation systems were first developed by the:

the indians crossed artificial boundaries, setting the stage for conflict

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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.

its b wells tried to fight lynching in the south by