In the eighteenth century, matthew reopened trade doors with japan.
a. perry
c. columbus
b. cortez
d. cartier

The answer is Perry or letter a.  He landed in Tokyo Bay with a large fleet of warships in 1853 and demand supplies for his ships.  He gave the Japanese time to consider and would later return.  Knowing they could not stand up to such modern weaponry the Japanese signed the Treaty of Kanagawa on March 31, 1854 this ended their period of seclusion.

they have different colored collars

- "bill clinton ( the 42nd u.s. president, served in office from by low unemployment, declining crime rates and a budget surplus. during clinton's second term, the u.s. economy was healthy, unemployment was low and the nation experienced a major technology boom and the rise of the internet."