strong pressures for convergence due to a shared history and culture, or the establishment of a trading block where there are deliberate attempts to harmonize trade policies, infrastructure, and regulations have contributed to the rise in what trend?

The correct answer here is regionalism.

With establishing of trade blocks we have a rise in regionalism. This means that certain parts of the world that have some shared characteristics and interests will group together to create one shared market for that region. So for example the European Union is the one example of the regional trade block.