The tactic that Filipino insurgents use to undermine American power is: <span>C. guerilla warfare
Guerilla warfare is a warfare strategy where the troops are hiding within the terrains (usually they're familiar with the terrain) and obtain advantages toward the enemy using the element of surprise</span>
A concept that medieval England had was common law, which is the same that we share in the U.S government. Common law is one of the main pillars of the government.
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( C ) It allowed only two percent of a particular nationality would be admitted each year