Interstate migratIon is an interesting element in American national life.
I'll bet it's close to Interstate 70.
Most of the route was via Interstate roads and easy driving.
In 1907 active preliminary work was begun on the Louisiana section of a great interstate inland waterway projected by the national government between the Mississippi and Rio Grande rivers, almost parallel to the Gulf Coast and running through the rice and truck-farm districts from the Teche to the Mermenton river (92 m.).
Commercial interests have been almost entirely destroyed, partly because of the abolition of the slave trade and partly because of the embargo and the war of 1812, but mainly because the cities of the state are unfavourably situated to be the termini of interstate railway systems. Providence, owing to its superior water-power facilities, has therefore become one of the leading manufacturing centres of New England, whereas Newport is now known only as a fashionable summer resort.