both direct and indirect elections
Not in the US. Any discrimination based on race is prohibited by law. That includes voting rights.
Antebellum South Carolina had a policy of sending electors to the Electoral College based on the voting in the state legislature.
for keeping us safe
I think this is actually 2 questions. Every one of the US states have voting members in Congress. Usually each state has 2 Senators and a number of Representatives (based on the population of the state.) However, US territories are not states and do not have voting members in either the Senate or House of Representatives.
The US classifies non-citizens based upon the avenue of entry into the US.
18 is the legal voting age in the US.
When voting rights were extended to citizens who previously did not have voting rights, there was more pluralism in the US. When the 19th Amendment was passed in 1920, the votes granted to women expanded the numbers of people voting in the US.
No.
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The Virginia Plan proposed the idea for a bicameral legislation based on population. Prior to that, there was a unilateral congress. Before representatives were based on population, every state had one vote.
Voting age across the US is 18 everywhere
by voting