"the territory of the united states is of vast extent; it now contains near three millions of souls, and is capable of containing much more than ten times that number. is it practicable for a country, so large and so numerous as they will soon become, to elect a representation, that will speak their sentiments, without their becoming so numerous as to be incapable of transacting public business? it certainly is not."
which founding document and idea does this excerpt reflect?

Brutus No. 1—republicanism

Explanation:

The excerpt is taken from the document I called Brutus No. 1, which is the first anti-Federalist essay, from the collection of 85 anti-Federalist newspaper essays, which were written by people who were against the creation of the US Fedeal Constitution. This excerpt is talking about republicanism, which is the ideology according to which a nation is governed as a republic, in which the head of state is appointed by nonhereditary methods, often by elections.

answer; in the 1950s;

the answer is a. snails i think