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Gibbon is able to make this claim since he shows that technological advances have skyrocketed since the Industrial Revolution, and he thinks this progress will continue thanks to the computer age.
The present-day Republican Party is descended from the "Whig Party", and formed mostly out of an opposition to slavery and its expansion. Although it should be noted the present day Republicans barely resemble the original Republicans.
Because they wanted a different way to show people o hope this helps you