What was the name of the Native tribe
the inhabited the Great Plains Region?

2018 means 2018 ce or common era

there have been other eras too including bce, which included way more years.

in 1989, tiananmen square in beijing was the site of china’s main industries. china’s government headquarters. -pro-democracy demonstrations. (second choice)

according to worldatlas.com, the u.s. has an 86% literacy rate.