Who was Aguinaldo and what was his expectation when the Americans defended the Spanish
in Manila Bay?

Emilio Aguinaldo was the first president of the Philippines.

Explanation:

Emilio Aguinaldo was a Filipino revolutionary, politician and the first president of this country. Against the Spanish forces led the people in the second part of the uprising against the Spanish colonization. He also led the people of the Philippines in the war against the united states. Aguinaldo is celebrated as a national hero and in 1935 was elected president. He expected Americans to support his country's independence after fighting with the Spanish. Yet it happened that the Americans took control of the country. This was the reason for the Filipinos to continue their struggle for independence.

the option which was not a function of missionaries in the northwest was the first one - they established posts for trading furs and other goods.

missionaries were sent around the world to spread religion and their knowledge and others - they were not merchants who sold furs and other goods.