Answer:
Constantine XI Palaeologus
Explanation:
that's my answer please
Factors leading to the expansion of the Texas frontier. Texas Frontier Timeline, 1866-1875 · Texas Frontier Timeline, 1876-1882 · U.S. Army on the Texas Frontier · Windmills · "Forting up" on the West Texas Frontier.
B) Truman Doctrine.
I hope this answer is right.
