What was the environmental tree of the factory system

Why do we observe black history minth?

Which of the following was used only once, to ratify the 21st amendment (repealing prohibition)? a.three-fourths of both houses of congress. b.three-fourths of the state legislature approved it. c.two-thirds of the state legislature approved it. d.ratifying conventions in three-fourths of the states approve it.

Before world war 1 started, austria-hungry was wary of (spain or serbia) because of border disputes