They lived among the Hidatsa and Mandan Indians in the upper Missouri River area (present-day North Dakota). In November 1804, an expedition led by Meriwether Lewis and William Clark entered the area. ... Lewis and Clark met Charbonneau and quickly hired him to serve as interpreter on their expedition.
The massive turmoil that the Reformation caused had a lasting impact on European politics. Soon after the Catholic Church deemed Martin Luther a “protestant,” Europe became divided along confessional, as well as territorial, lines. The religious turmoil of the period led to warfare within most states and between many.
The historians could be wrong without proper proof to back up their so-called "facts". Therefore, they would need to study and know what they're talking about, before presenting their statements as facts.
The polis can best be described as a moral community of citizens. Therefore, your answer is True.