This is most likely specifically asking for World War I.
The first thing is rather not a gain, but a trust. Most of Europe, Asia, as well as the Middle East and Africa, were split into two camps. These camps were alliances, known as the Central Alliance (the German & Austrio-Hungary camp), and the Allies (The British & French camp).
The war was triggered by the assassination of Archduke Franz Ferdinand and his wife Sophie by a Serbian Nationalist who wanted to see a free Serbia. While Serbia was open to paying for reparation, Austrio-Hungary threw away the table in hopes of conquering and claiming Serbia for their own. The failure for the gears of war to stop before then was what caused the countries to go at war. Each country was bound by their alliance contract to help their members at need, and so it set off a chain reaction that ensued into a global war.
They had nothing to gain, but to keep their own honor, the survivability of their state, and the trust of their allies.
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The document that institutionalizes American ideas is "the Declaration of Independence".
<u>Explanation:</u>
The Declaration of Independence (DoI) and the Constitution are documentation that provide the idealistic pillars for the United States' democratically elected government.The independence or DoI, provides a framework for the principles of popular sovereignty, the notion that government is needed to serve the public who elect a leader to convey their desire.Whereas the Constitution of U.S illustrates its government program's blueprint, which seeks to equalize freedom of the individual with law and order.
i think its either c or a but im not entirely sure but i hope this helps you a little more then nothing.
The countries the Britain conquered and we ruled those countries