In 1823, the monroe doctrine was established mainly because the united states wanted to
a. keep control of alaska and hawaii.
b. establish more colonies in latin america.
c. support england's attempt to keep its empire in central america.
d. warn europe against any further colonization in latin america.

The answer is d. warn Europe against any further colonization in Latin America. At this point, the United States was now asserting its authority in the continent.  They believe that it was their destiny to settle within these territories and at that point, they were determined that Europe would no longer colonize anymore land in the Americas.