Northwest territory in 1785 what formed the southern boundary of the northwest territory?What formed its western boundary

The upper Mississippi river formed the territory's western boundary. It created the northwest territory. The 1st organized territory of the United states, from the lands of the Appalachian mountains

Explanation:

president thomas jefferson commissioned the expedition shortly after the louisiana purchase in 1803 to explore and to map the newly acquired territory, to find a practical route across the western half of the continent, and to establish an american presence in this territory before britain and other european powers

explanation:

japan participated in world war i from 1914 to 1918 in an alliance with entente powers and played an important role in securing the sea lanes in the west pacific and indian oceans against the imperial german navy as the member of the allies.