Why did diseases spread so rapidly in the americas after european explorers arrived?
the diseases affected the body’s major organs.
the diseases were highly contagious.
the diseases affected the immune system.
the diseases were harmful to the skin.

Explanation:

The calamitous epidemics that went with the European victory of the New World destroyed the indigenous populace of the Americas. Flu, smallpox, measles, and typhus fever were among the main European infections imported to the Americas. During the initial hundred years of contact with Europeans, Native Americans were caught in a virtual snare of new maladies. European infections, seeds, weeds, and creatures irreversibly changed the first organic and social scene of the Americas. By 1518, the Native American statistic fiasco and the requests of Spanish settlers for work prompted the importation of slaves from Africa. In this way, the Americas rapidly became the site of the mixing of the peoples and infectious agents of previously separate continents.

chemicals that are toxic to plants

the installment plan of the 1920s, an arrangement that allowed people to buy what they wanted with a small down payment and pay off the rest in monthly installments, provided americans a way to own what they did not have the money to buy.