Forex Brokers & Trading Platforms

I’m a US citizen, living in the states. Why does so many brokers refuse to do business with us? I’m looking for a regulated and secure broker willing to accept US traders, with the lowest variable spreads, allows scalping and hedging with solid tutorials. Any suggestions?

I started trading common stock 25 years ago as a technical analyst. The graphing capabilities in the MT4 software is awful. What other platforms might there be with enhanced charting/graphing features, that also is capable to present volume activity for analysis?