On Tuesday, Delaware will become the first state to allow sports betting following the Supreme Court’s decision to overturn legislation banning sports betting.
Delaware will begin offering single game betting for various sports in the state's three casinos Tuesday afternoon. On May 14th, the Supreme Court overturned the Professional and Amateur Sports Protection Act which banned sports betting in the majority of U.S. states paving the way for states to allow sports betting. Other states are expected to follow suit shortly thereafter as New Jersey is attempting to pass a bill next week to regulate sports betting while other states have legislation in place already.
http://money.cnn.com/2018/05/31/news/companies/sports-betting-delaware-sportspick/index.html