Sort these events in the order in which they occured. 1. The Crusades begin.
2. Jerusalem is conquered by the Turks.
3. Prince Henry's navigation school begins.
4. The Cape of Good Hope is discovered.
5. An all-water route to India is discovered.
6. Europe begins demanding Eastern luxuries.
7. Marco Polo travels to China.

option d is correct. corroborated sources of historical evidence   is necessary to validate a claim about an event in history.

historians tend to use written sources, but audio and visual materials as well as artifacts are important objects that supply information to modern historians.

historical sources are usually divided into two categories: primary and secondary sources. depending on the historian's intent, some sources shift their designation. determining what type of sources toimplement, and the level of credibility and reliability of those sources, is a significant step in critical thinking for the historian.

explanation:

basic principles: federalism, separation of powers, checks and balances, judicial review, representative democracy, limited government, rule of law, individual rights and responsibilities, consent of the governed, majority rule, popular sovereignty, equal protection.