Many experts see as the dominant theme of present and future world history.

The correct answer is globalization.
In our contemporary world, globalization is an important issue. Trade, investments, culture, informational technology - all of these things are shared worldwide nowadays and spreading across the globe, which is what globalization is about. It is likely to spread even more in the future.

The president's only official legislative duty is to sign or veto bills.

My opinion is that it doesn't