What do you think happens to the reservation land left over
once the allotments are given
out?

The remaining tribal land would be sold to non-Indian farmers and ranchers.

Explanation:

Each tribal member was appointed a portion and, after a “trust” period (which last for 25 years) would be assigned a document to it, enabling the owner to sell it. Tribal lands not allotted to Native Americans on the reservation were to be sold to the United States and the land would be opened for homesteading. Once the allotments were issued, the remaining tribal land would be sold to non-Indian farmers and ranchers.  

President Harrison died just one month after taking office, and Tyler became the first vice president to succeed to the presidency without election.

Explanation:

The president died meaning someone had to take the place so the vice president did and that was John Tyler.