sentences:  After a period of political instability, 1598 to 1613 the Romanovs came to power (1613) and the expansion-colonization process of the Tsardom continued.While western Europe colonized the New World, Russia expanded overland - to the east, north and south.This continued for centuries; by the end of the 19th century, the Russian Empire reached from the Black Sea to the Pacific Ocean, and for some time included colonies in the Alaska (1732-1867) and a short-lived unofficial colony in Africa (1889) in present-day Djibouti.