Transportation in the 19th century linked to Manifest Destiny by making it easier to get from one place to another faster and spread out.
They feared that the north would over run them and abolish slavery which the south ''needed''
The 3rd one is the answer
The House of Representatives of States, is the lower house of the United States Congress, while the upper house is the Senate. Each state obtains representation in the chamber proportional to its population, with the right to a minimum of one representative, who are elected by unitary majority scrutiny in most states and with non-partisan general primary with second majority in three states; The most populous state, California, has 53 representatives. The total number of representatives is currently set at 435 by the Reapportionment Act of 1929, although Congress retains the power to modify that number. Each representative is elected for a period of two years and may be re-elected.
One of the main arguments that colonizers used to justify how they took control over the new territories that Columbus discovered in 1492 in the so-called "New World", was that their main purpouse was Evangelism.
Evangelism is the denomination of the process that consists on extending the teachings and principles of the Christian religion worlwide. Therefore colonizers were complying with their duty as Christians of spreading the message of Jesus Christ among the pagan native civilizations encountered in America.