Why did stronger nations take over weaker nations?

Imperialism occurs when a strong nation takes over a weaker nation or region and dominates its economic, political, and cultural life. ... The western countries sought to expand their economies by obtaining raw materials from the colonies which could be transported back to factories and are turned into manufactured goods.

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i think it is the third one.

the earthquake in haiti was a magnitude of 7.0 according to the u.s geological survey yet the smaller earthquake in haiti killed more than 200,000 and left more than 1.2 million people homeless. the chile earthquake was a magnitude of 8.8 and 500 times more stronger but chile's earthquake only injured 712 people.