While the Continental Mark III would bring Lincoln into the decade on a high note, for the American luxury car segment, the 1970s would prove tumultuous. Along with the introduction of federal safety regulations for American-market automobiles (which brought features such as 5-mph bumpers and the end of hardtop body styles), the 1973 fuel crisis would play a significant role in the engineering of American automobiles, forcing Lincoln to develop a compact-size sedan and redesign smaller full-size sedans for the 1980s. As Chrysler withdrew its Imperial brand after 1975, Cadillac became the sole domestic competitor of Lincoln.