Why Did Western Territories Take Longer Than Eastern Territories to Achieve

Why did western territories take longer than eastern territories to achieve statehood?

A) Many easterners were wary of granting statehood until white and non-Mormon settlers counterbalanced the large Latino and Mormon populations.
B) Local leaders were hostile to federal involvement in territorial affairs and resisted calls for statehood.
C) Long-term warfare with native peoples made the establishment of stable communities difficult for white settlers.
D) The Mormon and Latino populations in these areas did not grow rapidly enough to reach the requisite numbers for statehood.
E) Settlers experienced more difficulty than easterners had moving native peoples off the territory.