I think the Answer is Internal combustion engines differ in a fundamental way
Subsidiary Alliance is a system by the East India Company. It solved the problem of ruling a nation which is under the rule of a king
The answer is human resources
Roosevelt's personality and political philosophy fitted the imperatives far more than they did the fashions of the times, so that the degree to which his behavior in the White House both hastened and shaped the dramatic growth of presidential power over the next seventy-five years must be seriously considered. Temperamentally, Roosevelt craved attention. Once in the White House, especially in view of the changed national and international circumstances, he could not fail to focus national attention on the presidency.
