Bernardo de Gálvez contributed to the American Revolution by A. Giving colonists access to the port of New Orleans and helping them capture British forts.
B. Giving colonists access to French forts and helping them capture Spanish forts.
C. Fighting as a Spanish soldier at the siege of Yorktown and in other key bottles.
D. Fighting as a continental army general who became a symbol of the colonies’ strength.

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:

i'm not certain but i'm pretty sure it was spanish and portuguese america.

i beleive that it was john rolfe

asthenosphere/ lithosphere would be the answer