Read this article about the precipitating factors of European imperialism toward the rest of the world, including Africa. The export of violence would "come home to roost in 1914".
The Second Industrial Revolution
Technology thus enabled
imperialism. It also created a motive for imperialism, because of a
phenomenon referred to by historians as the "Second Industrial
Revolution". The Second Industrial Revolution consisted of the
development and spread of a new generation of technological innovation:
modern steel, invented in 1856, electrical generators in 1870 (leading
to electrical appliances and home wiring by 1900 in wealthy homes), and
both bicycles and automobiles by the 1890s. The American inventor
Alexander Graham Bell invented the telephone in 1876, and thousands of
phones, carrying millions of calls annually, were in operation already
by the early 1880s. These advances created a huge demand for the raw
materials – rubber, mineral ores, cotton – that were components of the
new technologies.
In the initial phases of the Industrial
Revolution, the raw materials necessary for production had been in
Europe itself: coal deposits and iron ore. The other raw material,
cotton, that played a key role in the Industrial Revolution was
available via slave labor in the American south and from weaker states
like Egypt (which seized virtual independence from the Ottoman Empire in
1833). The raw material of the Second Industrial Revolution, however,
was mostly located outside of the older areas under European control,
which meant that European business interests pressured their respective
governments to seize as much territory overseas as possible. For
example, when oil fields were discovered in Persia in 1908, European
interest in Middle Eastern imperialism reached a fever pitch, with
European powers cultivating contacts among Arab nationalist groups and
undermining the waning unity of the Ottoman Empire.
Mines and
plantations were crucial to this phase of imperialism in Africa and
Asia, as they had been to the early European exploitation of the
Americas. Mining in particular offered the prospect of huge profits.
There were Canadian nickel deposits for steel alloys, Chilean nitrates,
Australian copper and gold, and Malaysian tin, just to name a few
mineral resources coveted by Europeans (of course, in the case of
Canada, the people being colonized were Indigenous Canadians, and the
colonists were themselves of European descent). Thus, while the motives
behind imperialism were often strongly ideological, they were also tied
to straightforward economic interests, and many of the strongest
proponents of imperialism had ties to industry.
While the United
States was not one of the major imperial powers per se (although it did
seize control of the Philippines from Spain in 1898 and exercised
considerable power in Central America), it played a major role in
imperialism nonetheless. The US eclipsed Europe as the major
manufacturing power and the major source of exports in a shockingly
short period – from about 1870 into the early 1900s – driving Europeans
to sometimes-hysterical levels of fear of being rendered economically
obsolete. The response of European politicians and businessmen alike
was to focus on territorial acquisition overseas to counterbalance the
vast natural resources of the US, which had achieved its dominance
thanks to the enormity and richness of American territory (seized by
force from Native Americans). Thus, even though the US did not join in
the Scramble for Africa or assert direct control of East Asian
territories, fear of American economic strength was a major factor
driving European imperialism forward.

American resource production and industrial output vastly outpaced European production over time; already by the 1870s astute European observers correctly anticipated the rapid acceleration of American production.