In what year were aids discovered in america

1981

1980s. April 24, San Francisco resident Ken Horne is reported to the Center for Disease Control with Kaposi's sarcoma (KS). Later in 1981, the CDC would retroactively identify him as the first patient of the AIDS epidemic in the US. He was also suffering from Cryptococcus.

map scale refers to the relationship (or ratio) between distance on a map and the corresponding distance on the ground. for example, on a 1: 100000 scale map, 1cm on the map equals 1km on the ground.