What did events like the Walking Purchase prove about treaties between Europeans and Native Americans? a-They mostly served European interests. b-They were more effective than treaties in Europe. c-They had the power to prevent or put off war. d-They would last longer than most treaties.

a-They mostly served European interests.

this is correct ...

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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:

the answer is a) the proclamation of 1763.