What role did the us army play in the settlement of the west?

How would lincoln's assassination change the direction of reconstruction? the radicals used this opportunity to take control of the plans. the south refused to cooperate with any plans after lincoln his death would put an end to all reconstruction plans. lincoln was too weak to carry out his plan and now it could be carried out.

Why didn’t the portuguese have access to the territory that is present-day latin and north america

Why are nation-states difficult to create?