Which of the following most contributed to New York City’s transformation into an important port and center of trade? - The invention of the railroad
- The construction of the Erie Canal
- The invention of the mechanical reaper

The term 'white man's burden" refers to the difficulty of converting colonists to christianity. the belief that europe had a duty to civilize other people. the conviction that white people were superior to all others. the struggle to survive in an increasingly industrialized world.