The southern boundary of washington territory was

The southern territory of the Washington territory was perrton,present day Wyoming.

Explanation:

The Washington territory emerged as a result of the proposed territory of Colombia.

The southern tip of this territory was Wyoming.

It was created from the portion of Oregon territory north of the lower Columbia River. Before attaining it's final boundaries in 1863, it incorporated modern Idaho and Wyoming.

the answer to this question is the third option. hope this

1.) irish.

2.) settlers could obtain cheap land nearby

3.) steam engine

explanation: