Random attacks by Indian tribes. The frontier had swamps-to-mountainness terrain. Seeds didn't work in all parts of America, some lived healthy in one area while the same seed could die somewhere else there.
Answer: 2,000,000 acres of unassigned lands lying in Indian territory.
Should be nation(s).
Austria, Hungary, Czechoslovakia, and Yugoslavia.
B. Extremely cold temperatures all year long preventing any human activity.
