How did technology contribute to the expansion of European power through imperialism?

Technology such as railroads, improved ships, weaponry, medicine, etc. had caused a major impact and advantage for European powers. It allowed them to conquer undeveloped nations in the continents of Africa and Asia (also Australia by Britain). With the use of guns and faster transportation Europeans could use less manpower to eliminate entire foreign armies. One great example was the British expansion in Africa. With modern rifles and pistols, they could easily advance against the native warriors. Medicine also allowed the British to move more in-land Africa and the use of steamships. Technology gave Europeans a great advantage over other countries.