Which statement best describes the effects of the 1851 Treaty of Fort Laramie?

As an effect of the 1851 Treaty of Fort Laramie, the Indians crossed artificial boundaries setting the stage for conflict.

Explanation:

The first treaty in Fort Laramie was signed on September 17, 1851 between US officials and representatives of Dakota, Sheen, Arapah, Crows, Shoszon, Assiniboin, Mandan, Hidats and Arikar Indians.

The US government promised the Indians their control over the Great Plains, which constituted the greater part of the Indian Territory. For their part, the Indians guaranteed safety to settlers heading west along the Oregon Trail in exchange for a pension of 50,000 dollars paid annually for 50 years. Native Americans were also to allow the construction of roads and forts in their territories.

Later, the US Congress unilaterally (without agreement with the Indians) shortened the period of payment of the pension to 10 years, and some tribes never received the payments due to them. The treaty brought about a relative peace for several years.

Answer: Indians crossed artificial boundaries setting the stage for conflict.