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because they had Suez Canal
It motivated other European countries to seek African colonies for their economic benefit.
The Suez Canal, which linked the Mediterranean Sea to the Red Sea, meaning that British ships did not have to sail around Africa to reach India, a hugely important route for British (and French trading).
The Suez Canal connects the Mediterranean Sea and the Gulf of Suez. This typically would have been dug by hand, but the canal utilized new steam technology and dredging systems to create the canal. When Egypt took over the Suez Canal Company, it marked the end of the British Empire's control on the area.
provided a strategic shipping route to British colonies.
Most canals were built after the Roman Empire split, for example the Suez Canal, the Panama Canal, and the Erie Canal.
Sudan was part of the main shipping route to the East. Britain needed to control the Suez Canal.
Theodore Roosevelt
It hasn't, although a lot of countries left the Empire is still going even if it is small.
The US encouraged the separation of Panama from Nicaragua, of which it was previously a part.
It was Theodore Roosevelt Theodore Roosevelt
The British wanted to construct the Suez Canal in order to sail to Asia without having to sail around Africa. The canal became a vital part of the British Empire because it created a strong link between India and Europe that allowed Britain to maintain control of its overseas possessions.