http://atimes.com/2016/09/us-pivot-t...pacific-waves/

Barack Obama’s Asia pivot is sinking beneath Pacific waves

They conceded that the great game is about maintaining US hegemony in the Asia-Pacific.
Economic:

Japan’s, Australia's, and Singapore's political leaders all stated the outcome of the TPP will determine the future of U.S. leadership in the Asia-Pacific.

But doubt is growing in the Asia-Pacific as to whether TPP will see the light of day. Nothing else can explain the last-minute rethink in Hanoi to shelve the ratification of TPP at the forthcoming session of Vietnamese parliament.
Military:

the 8-day long China-Russia naval exercises in the South China Sea, which concluded on Monday, would have a multiplier effect. The grand finale of the exercises was a spectacular amphibious and air landing operation on an island off the coast of China’s southern Guangdong Province, which the region watched with riveting attention.
As the article stated, this was a clear effort by China and Russia to challenge U.S. leadership in the region. Duarte, the current and controversial President of the Philippines, stated (inaccurately) that China was the preeminent military power in the region.

The perception of the U.S. faltering in both the economic and military realms gives China impressive information and diplomacy power to further push their agenda of marginalizing the U.S. in the Asia-Pacific, while simultaneously U.S. leadership/influence seems to be shrinking in the Middle East and Europe. If this trend continues, we will need to determine what an appropriate U.S. national security strategy when the U.S. is no longer viewed as a global leader. I am sure there are lessons from the past.