<span>transports first of all, to make trade easier: more highways, especially the one connecting to other countries. And new, bigger and more efficient airports, both for tourism and commerce. Oher structures that have been made more modern and functional are for example hotels, to guest more people.</span>
One of the main ways in which the United States attempted to strengthen its ties and influence with the nations of Latin America was by declaring that further attempts to colonize this area by Europeans would be met with resistance by the US--as embodied in the Monroe Doctrine.
I think that it is c. because it makes the most sense.
