Social security's long-term viability continues to remain uncertain because

answer:

the missouri comprommise line attempted to resolve the issue of slavery by drawing a line north-south through the louisiana purchase.the missouri comprommise line attempted to resolve the issue of slavery by drawing a line north-south through the louisiana purchase.the missouri comprommise line attempted to resolve the issue of slavery by drawing a line north-south through the louisiana purchase.the missouri comprommise line attempted to resolve the issue of slavery by drawing a line north-south through the louisiana purchase.

explanation:

i'd assume india mainly because of how isolated japan was.   plus it is a whole china away.