To recover the damage done bij Hoover on the economics.
After defeating the Americans at the Battle of Bunker Hill, the British realized that beating the Americans would not be an easy task. They suffered a massive loss in their troops.
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The rightly guided caliphs were successful in spreading Islam because they would fight for the sake of God(Allah) and spread the world of Islam peacefully. They would show practice their religion by being nice and peaceful toward others and helping others.
Also, when Muslims traded they traded fairly, which made the people want to learn more about Islam. They spread it to their families, which later made the population of Islam grow rapidly.
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Thanks have a good day...