The United States was once under an oligarchy government in the 1800's. true or false?

That statement is false.

Explanation:

Oligarchy is a system of government in which the power in the country is controlled by a small group of people (could be based on nobility, milltuiary, or education.)

Untied States was under an oligarchy government when the country is under the British' rule.  But, this occurred in 1700s, not 1800s.

USA gained independence from the British government in 1776 and the country has been run with a democracy system ever since.

unless they converted, many non-christians (mainly jews and muslims) were persecuted

the arab empire adopted the muslim religion as their main belief. arabs would influence the people from the territories they invaded towards islam (the muslim belief).

nevertheless, throughout the history of the arab empire, rulers brought intellectual individuals from other religions to their centers of learning. these other foreigners included jews, christians, greeks, persians, and indians.   these resulted in the adoption of important knowledge developed by these cultures by the arabic empire. for example, the works of aristotle were translated from greek to arab and indian scientists brought the numerical concept of "zero" to the arabs.

nowadays, 93% of the arab population is muslim, which at the same time is subdivided in sects including the sunni, zaini, alawi, shia. the remaining 7% is composed mainly of christians.