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Seven years later, in 1803, when Ohio was carved out of the Northwest Territory, Zane’s Trace was the only road in that entire state.
In 1804, workmen repairing what had become a thoroughfare uncovered Braddock’s bones and medals near what is now Farmington, Pennsylvania.
In 1818, the road reached Wheeling, where construction stalled.
In 1829, Fairview House, aka Three Mile House, did land office business on the National Road near Frederick, Maryland. (Granger, NYC)
Indiana was less populous and had a terrain more amenable to roadbuilding, enabling crews to work to a lower standard and lay a road across that state by 1834.
Voted out of office, Van Buren was on the hustings in 1842 when he passed between Indianapolis and Terre Haute.
In 1916 Congress passed the first highway appropriations bill since the measure funding the National Road.
Eisenhower’s formative experiences in the 1919 Transcontinental Motor Convoy in the new Eyewitness exhibit
The Federal Aid Highway Act of 1938 directed the Bureau of Public Roads (BPR), the predecessor of the Federal Highway Administration (FHWA) to study the feasibility of a toll financed system of three east-west and three north-south super highways.
The Interstate System was first described in a Bureau of Public Roads report to Congress, Toll Roads and Free Roads, in 1939.
The limited-access design of the Pennsylvania Turnpike, which opened in 1940, became a model for future superhighways. Its 1939 report, Toll Roads and Free Roads, was the beginning of the concept for the Interstate Highway System.
The limited-access design of the Pennsylvania Turnpike, which opened in 1940, became a model for future superhighways.
In 1941, President Franklin D. Roosevelt appointed a National Interregional Highway Committee, headed by Commissioner of Public Roads Thomas H. MacDonald, to evaluate the nation for a national expressway system.
Legislation in 1945 authorized an additional $175 million annually for FYs 56 and 57.
On August 2, 1947, Commissioner MacDonald and Federal Works Administrator Philip B. Fleming announced the selection of the first 37,700 miles of routes, which had been proposed by state highway agencies and reviewed by the Department of Defense.
The Federal-Aid Highway Act of 1952 authorized the first funding specifically for System construction, but it was only a token amount of $25 million per year for FYs 54 and 55.
After he became United States President in January 1953, Eisenhower appointed General Lucius D. Clay to investigate an interstate highway system.
Missouri was first state off the block when on August 13, 1956, work began in St Charles County on US-40, which is now named I-70.
Gulfgate Shopping Center and residential development along I-45, Houston, Texas, about 1960
In 1966, the Interstate Highway System was designated as part of the Pan-American Highway System, linking Canada, the United States and Mexico.
In 1968, the Federal-Aid Highway Act authorized the system's expansion to 42,500 miles.
In 1973, these concerns brought changes that channeled federal highway funds to mass transit, bikeways, and pedestrian walkways as well as highways.
In 1973, in an effort to raise prices and in response to American foreign policy in the Middle East, the Organization of Petroleum Exporting Countries placed an embargo on oil going to the United States.
Harvey Milk, one of the first openly gay politicians to win public office in the United States, a seat on the San Francisco Board of Supervisors in 1977.
By 1980, most small cars purchased in the United States were foreign imports, with Japan dominating that market.
Candace Lightner founded Mothers Against Drunk Drivers (MADD), a citizens’ movement to fight leniency and indifference toward drinking and driving, in 1980.
The first minivans—the Dodge Caravan and Plymouth Voyager—were introduced in 1983, after six years in development.
Papago Freeway (I-10) as built, Phoenix, 1991
The 2000 census found more Americans in the suburbs than in cities.
"The Year of the Interstate" from the January-February (2006) issue of Public Roads.
In actuality, it ended up costing $114 billion (in 2006 dollars $425 billion) and took 35 years to complete.
On September 22, 2018, the Pennsylvania Turnpike/Interstate 95 Interchange Project which filled the gap in I-95 was completed.
Up until 2018, there were actually two discontinuities in the Interstate Highway System: I-95 in New Jersey, and I-70 in Pennsylvania.
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