What effect did the portuguese school of navigation have on future explorations?

What event caused south carolina to secede from union in 1860

How did the government restrict immagration in the 1920

Which instance of political expression would be considered symbolic speech? a. a student wearing all black to call attention to political issues b. a candidate for congress giving an interview to the media c. a demonstrator chanting anticorporate slogans outside a company’s headquarters d. a local citizen speaking up at a town hall meeting