I believe the answer you're looking for is the factory system.
Beringia was basically the uncovered floor of the Bering Ocean between and around Siberia and Alaska. History specialists theorize that our ancestors crossed the Bering Strait from Siberia into Alaska during the final Ice Age.
Please correct any mistakes in my answer!! :)
Answer:
Identification with one's own nation and support for its interests, especially to the exclusion or detriment of the interests of other nations.
Example:
Any situation in which a nation comes together for a specific cause or in reaction to a significant event. The Battle of New Orleans in which Americans united at the conclusion of the American Revolution. The waving of flags and passionate anthem singing.
The correct answer to your question would be D - A trade policy that encourages exports while discouraging imports, mainly through tariffs.
The reason why this is the answer is because protectionism in its essence tries to restrain, limit and make trade less prominent between two nations by doing exactly that; encouraging exports and discouraging imports. This can be done in many ways. The idea behind this is that this serves and protects the interest of one nation (the protectionist one) and "evens out" the trading playing field.