51.   But in recent decades, and especially since the advent of Pop Art, the traffic has been two-way and getting heavier.

52.   But in recent decades, it is the executive branch that has been most voracious, followed by the judicial, and the legislative the most intruded upon.

53.   But in recent decades, war, economic uncertainty and political upheaval have scattered her family.

54.   But it is not the proliferation of computers and other electronic equipment that has caused energy consumption to rise in recent decades.

55.   But his overall vision of Nixon cannot be neglected as historians continue to assess the man who was probably the most interesting president of recent decades.

56.   But many parishioners moved away in recent decades, and others grew old and sick.

57.   But in recent decades the Confederate battle flag has been used primarily as a symbol of resistance to civil rights and full equality for black citizens.

58.   But in recent decades, as development has spread north, the curving road has become a major commuter route jammed with thousands of cars.

59.   But in recent decades, as the government outlawed such killings, it encouraged bear farms as a substitute.

60.   But in recent decades, state legislatures have often used windfalls for purposes unrelated to the circumstances that produced them.