In the years between the 1820s and 1830s the only country to successfully overthrow imperial rule was
a.
portugal
c.
italy
b.
spain
d.
greece

A) Portugal.

Explanation:

There was a war, the Portuguese Civil War (1828-1834) between the Miguelites (led by Dom Miguel) and the Liberals (led by Dom Pedro). The Liberals won and with the signature of the Concession of Evoramonte, Imperial rule was terminated.

b]to spread the message of black power

c) troops march forward in close formation against newer, more accurate weapons