This party promised to uphold the principles of republican government and vowed to fight the spread of slavery a) know-nothing party
b) republican party
c) whig party
d) democratic party

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a. because the u.s. was the leading with the most technology, economy, etc. also was teamed with other allies witch boosted the economy and materials to improve technology and use it.

6 or 2

explanation:

hope this you

but i think its 6

some american cities felt workers were being oppressed by business monopolies