Law has historically been the most important generator or social change.

porter is writing economic history because he is focusing on the cost of developing vaccines.

the answer is a, salt plain

the first forms of writing came from them in the form of pictographs around 3100 bc.

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.