Briefly explain how the three branches of government have roles that check or limit the others so that no single branch can dominate the government

What do historians call the political,social,or cultural circumstances surrounding an event?

Which of the four planes was hijacked first? a.flight 175 b.flight 77 c.flight 11 d.flight 93

Which source would best a historian understand the effect of the great chicago fire on families? a. a biography of a chicago family displaced by the fire b. a letter from a grandmother in new york to her family in chicago c. a newspaper editorial about families who were displaced d. an oral history dictated by an adolescent who fled the fire