Original sentence: As automobiles became more attainable to most Americans, the freedom, increased convenience and individualization of automobile travel became the norm for most Americans.Government actively began to respond with funds from its treasury and later with fuel-tax funds to build a non-profit network of roads not subject to property taxation.Governmental entities built urban and suburban airports, funded construction of highways to provide access to the airports, and provided air traffic control services.Highways then surpassed the for-profit rail network that the railroads had built in previous generations with corporate capital and government land grants.In the 1950s affordable commercial aviation expanded.The passenger rail industry declined as governments put money into the construction of highways and government-owned airports and the air traffic control system
Edited sentence: As cars became more attainable to most Americans, this newfound freedom and individualization of transit became the norm for most Americans because of the increased convenience.Government actively began to respond with funds from its treasury and later with fuel tax funds to build a non-profit network of roads not subject to property taxation that rivaled and then surpassed the for-profit network that the railroads had built in previous generations with corporate capital and government land grants.Government at many levels supported aviation.Governmental entities built sprawling urban and suburban airports, funded construction of highways to provide access to the airports, and provided air traffic control services.In the 1950s, a second and more formidable threat appeared: affordable commercial aviation.The passenger rail industry wilted as government backed these potent upstarts with billions of dollars in construction of highways and government-owned airports and the air traffic control system