Why did britain invade ireland in the fenian raid?

Between 1866 and 1871, the Fenian raids of the Fenian Brotherhood, an Irish Republican organization based in the United States, on British army forts, customs posts and other targets in Canada, were fought to bring pressure on Britain to withdraw from Ireland.

in 1803 the louisiana purchase took place, doubling the size of the country. by 1840 almost 7 million americans had migrated westward in hopes of securing land and being prosperous. the belief that settlers were destined to expand to the west is often referred to as manifest destiny.

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