Pull factors leading to immigration include job opportunities, political and religious freedom, access to education, and the prospect of a better life for oneś children. In the 20th Century these pull factors have encouraged migration primarily...

a
from less-developed (poor) countries to more-developed countries.
b
among people with similar religious beleifs.
c
among people with similar eating habits
d
from more developed (rich) countries to less developed (poor) countries

The migration during the 20th century has been mostly from less-developed (poor) countries to more-developed countries.

Explanation:

A is correct because during the 20th century, with the migration policies being made much more friendly and open, the people from the less-developed countries where the living conditions were terrible, to the more-developed countries where they could have much better lives.

B is not correct because it is actually the opposite, where people from different religious beliefs than those of the people of the county of their choice, have migrated and made much more diverse societies.

C is not correct because such migration has not been recorded so far.

D is not correct because the people from more-developed countries usually only visit the less-developed countries as tourists, but very very rarely migrate to them as they are aware of the risks and bad living conditions.

there's multiple reasons why the conquistadors were so successful in colonizing central america, and some of them are:

- they were seen as gods;

at the beginning, the spanish settlers were seen by the natives as gods, and this was mainly due to their white skin, and the way they came with their boats.

- possessed superior weaponry;

the spanish had gunpowder and guns, as well as cannons, while the natives did not had any fire weapons.

- made cleaver alliances;

they used the situation of tribes hating each other, so they made alliances with some of them which served them very well.

- brought diseases;

the native people were not immune to certain diseases the europeans brought with them, so they were dying from seeming harmless things for european standards.