Knoxville's textile and manufacturing industries were hurt by foreign competition in the 1950s and 1960s. After the building of the Interstate Highway system in the 1960s, the railroad—which had been largely responsible for Knoxville's industrial growth—began to decline. Suburban shopping malls in the 1970s took retail revenues away from Knoxville's Downtown area. So, the city sought to recover the massive loss of revenue by trying to annex neighboring communities in Knox County. People fought these annexation attempts. Several efforts to combine all of the Knoxville and Knox County governments failed. But the city and county school boards merged on 1 July 1987.