litical instability is lurking on the sidelines of American political life as well. The frequency of extra-judicial killings of African Americans by police from Staten Island to Baron Rouge, the killing of five police officers in Dallas and, perhaps the willingness of Donald Trump to dance up to, and occasionally cross, the line of encouraging insatiably are all evidence of this. The widening wealth gap, a sense among many that socio-economic mobility is limited, and more general racial and ethnic tensions also raise questions about continuing political stability in the US.