Why did Britain begin to expand its empire during the 1800s

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Britain's informal empire was aided by the Industrial Revolution, which provided the tools of Empire, such as the Gatling Gun, the railway, and the steamship. It was felt in Britain that the emerging Great Powers sought to emulate Britain's great power and status.

honestly you should get that checked out because it really isn't normal

yes based on alexanders actions he deserved the title of "the great". his empire covered about 3,000 miles and he was able to establish the empire over a 13 year period of time. he was able to conquer many different places. he also defeated the persians. he conquered egypt and developed a city and named it after himself.