Besides silk, the Chinese also exported (sold) teas, salt, sugar, porcelain, and spices. Most of what was traded was expensive luxury goods. This was because it was a long trip and merchants didn't have a lot of room for goods. They imported, or bought, goods like cotton, ivory, wool, gold, and silver.
One of the most important elements of Wilson's Fourteen Points was that there needs to be an international system that encourages cooperation between countries (especially in Europe) instead of competition.
You need these 3 elements in order to write motives:
Rhythm
Intervals
Harmony