15. The world's first supranational organization, was established after World War I.
It was initiated by U. S. president Woodrow Wilson, but because the U. S. did not actually sign it, the organization was
not very effective.

answer; ///(streak) is the correct answer

d. new methods of assembly are introduced.

explanation:

this allows for the goods to be made on a larger scale. not faster because now it is shown to be made better, hence the greater productivity in the question. it is calling for something new to be introduced.

answerpeople organize large projects such as levee-building;