The various mountain ranges in north American countries contain call another important natural resources which of the following describes the main Challenger Mountains presented settlers in North America

The climate in mountainous areas kept people from wanting to settle there

The mountains were difficult to cross which prevented trade with oversee countries

Building railroads to cross the mountains was dangerous and expensive

Access to the mountain ranges require fighting several wars

answer:

Explanation:

B or C... i know both of these things happened... Hope that helps!!!

a historian researching the immigration policies of the early 1900s would expect a source written today,rather than in 1910 to :

( a ) be more interested in objective data and statistics.

since most of current immigration into the u.s., both legal and illegal, is coming from latin america. it would be very difficult to imagine or rationalize a country my fellow citizens are trying desperately to flee into, would pose a threat to my prosperity or freedom. since the u.s. has a long history of intervention, but no record of permanent occupation, i would not feel oppression is the main objective.  

the largest free trade nation, along with the largest gdp in the world wanting to expand it's economic policy on us, and including us, could only be positive. the u.s. government has no interest in, or way of simply forcing american culture on us. and has no track record of it. other nations that adopted american social culture, or "americanization" did so voluntarily, mainly through the choice of allowing american businesses and u.s. citizens to come into their nations, as free operatives.