Stmatt- Except for the very high-risk areas in muslim territory and the like; the Gospel is often going forward naturally through people from that area rather than foreigners; although we obviously have missionaries in all parts of the globe.
The fields have been plowed, the seed sown from earlier times and the harvest is happening NATURALLY.
What can we do now? If God hasn't called one directly; then send money to those that are already there working in the harvest fields across the globe. In doing so; we have put our American resources to very good use while the other countries natural resources (the people) are being used to further God's Kingdom.