U.S politics and fault lines. Diplomacy and grand Asia Pacific tours. Congestion and conflict in space.

Damien Cave, the New York Times bureau chief here in Australia considers the big fault lines that have led to deep and lasting divisions in US politics and society.Richard McGregor reviews the grand tours by the U.S President and the Chinese Foreign Minister through the Asia Pacific.It's crowded and anytime now a fight could break out but there’s no sheriff in sight - which is why outer space is being compared to the wild west.