A subcontractor has a contract with the contractor for the services provided - an employee of the contractor cannot also be a subcontractor. Subcontractors undertake work that a contractor cannot do but for which the contractor is responsible.
Theodore Roosevelt became President in 1901 when President William  McKinley was assassinated that year. Roosevelt became the 26th  President of the United States.
Becoming the President: Roosevelt became president on September 14, 1901 when President McKinley died after being shot on September 6, 1901. He was the youngest man to ever become president at the age of 42. In 1904, he was the obvious choice for the Republican nomination. Charles W. Fairbanks was his vice presidential nominee.