The use of economic, political, and military pressure to create a sphere of influence in a region without formally annexing the area as a colony:

The use of economic, political, and military pressure to create a sphere of influence in a region without formally annexing the area as a colony is Informal Imperialism. It is use of indirect defines to control a zone and can be a military occurrence but is usually positioned around economic control. It was particularly common for the British empire. The British empire had a large military and economic presence and sufficient funds to spread out and colonize nations and territories. The industrial revolution assisted the British empires be fruitful. Technological improvements in military equipment and economic trade, such as new materials and trade capabilities, make informal imperialism mush at ease than before the revolution.

It might be the second one