Contractors, Article 4. Classifications. 7058. (a) A specialty contractor is a contractor whose operations as such are the performance of construction work requiring special skill and whose principal contracting business involves the use of specialized building trades or crafts.
The United States declared war on Germany for many reasons. One of them was the sinking on neutral ships and the lusitania which killed about 148 Americans. This was not the immediate cause, another is propaganda which persuaded public opinion.
Why did Hitler declare war on the U.S.? The relationship between the US and Germany was already very tense before Pearl Harbor. The US was supplying Lend Lease weapons and food to Britain. In addition, the US Navy was escorting the convoys until the Brits could take over the escort in mid Atlantic.