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Working in the latter mode and with the use of computer aides technology , leads logically to a further improvement in location accuracy by the substitution of time of arrival and phase of arrival measurements for those of strength of arrival . The expansion of slavery into western territories and the rise of the abolition movement increased tensions between the slave states of the South and the free labor states of the North . Slavery and freedom were the main issues of the mid-19th century when former Whigs , Democrats , nativists and free soldiers created the new Republican Party with a common position , " no further extension of slavery into the territories . That 's been a boon for the rapidly multiplying computer technicians who make house calls . Interactive computer solutions . Conservation equations for fluid mechanics , inviscid ideal flows , viscous flow solutions of Navier-Stokes equations , pipe flows and boundary flows , compressible flow , computer solutions and applications . Timing : A series of compromises over the extension of slavery had failed , and the nation was greatly divided .