With the harsh disputes and animosity derived from political ideology, different social and economic systems rooted in both camps, the gap between the North and the South was actually very hard bridged, which made the Civil War inevitable. Many Northerners abominated everything related to the South. William Seward, an influential Republican politician, once wrote:
Shall I tell you what this collision means? Those who think that it is accidental, unnecessary, the work of interested or fanatical agitators, and therefore ephemeral, mistake the case altogether. It is an irrepressible conflict between opposing and enduring forces, and it means that the United States must and will, sooner or later, become a either entirely a slave-holding nation, or entirely a free-labor nation. . . . [4]
To the Republicans, it was their moral obligation and divine mission to liberate the South for a free, modern and democratic nation. Above all, it was also their vision to build a world based on the success of the United States. Foner further