What occurred after the Territorial Legislature of New Mexico created Colfax County?

The creation of Colfax County by the Territorial Legislature of New Mexico in 1869 significantly affected local governance and land ownership. The correct answer highlights that the entire Maxwell Grant, a large land grant given to the influential Maxwell family, came under the jurisdiction of Colfax County. This meant that the government of Colfax County became responsible for administering the land and overseeing activities within its boundaries, which was pivotal considering the land's strategic and economic importance.

Establishing Colfax County aligned with the broader territorial governance and political organization during this period, allowing for more structured development in the region. The Maxwell Grant was one of the largest in New Mexico, and its incorporation into the county's jurisdiction set the stage for further developments in land use and population settlement.

The other options refer to significant events or decisions related to land ownership and legislative actions but do not directly relate to what happened immediately after the formation of Colfax County. For instance, while the sale of the Maxwell Grant to U.S. investors is an important historical fact, it is not the immediate outcome of the county's creation. Understanding the creation of Colfax County allows for a better grasp of how local governance was structured and how it impacted land ownership in New Mexico during that period.