Popular support wavered, morale ebbed away, and Congress abandoned Philadelphia. Throughout the 20th century the city's fortunes ebbed and flowed with the national trends. Muslim control of these areas ebbed and flowed repeatedly as a result until 870 AD. In short order, the group's numbers ebbed and flowed. Independence Air's fleet ebbed and flowed in an attempt to stay in business. For the following 20 years of Mexican administration the public school system ebbed and flowed. As the tide ebbed, the roadway dropped into place. After the building boom ebbed during the 1970s, infrastructure management shifted toward inspection and maintenance. The power of his benignity grew stronger as his potential influence ebbed. The war slowly ebbed due to the Treaty of Tyavzino in 1595. As Chinese power ebbed in the early 4th century, centralized states arose on the peninsula. His enthusiasm for teaching at the university ebbed in his final years there. The popularity of blaxploitation ebbed in the mid 70s and Brown made fewer films. Romney was worried that the firm might be destroyed, but the crisis ebbed. In 1912, the strike wave ebbed off.