Agolden era of american musical theater was created from about 1776-1820 1850-1875 1920-1960 1980 to the present

This statement is very true. there are records of many theater productions starting from the mid 1770's, until present day time.

Answer/// geometric period, archaic period,and classical period; geometric period is usually dated from 1000bcthe archaic and classical are 336bc to323bc;