Who is the most important leader in both houses of Congress?
the president pro tempore
the president of the Senate
the Speaker of the House
the Senate majority leader

The speaker of the house

Explanation:

is by far the more important and more powerful within the halls of Congress. This is particularly so because the Speaker is both the elected presiding officer of the House and the acknowledged leader of its majority party.

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.