How do I evaluate the competitive landscape of the US?

Most good ideas are being pursued by more than one company. In many cases there will be US competitors who are better funded and have been in the market longer than new entrants from abroad. Companies need to understand the competitive landscape and find the right position in the market to succeed. 

What do you recommend?

Figure out what competitors are there, who are they targeting, and how far along are they. Since they are most likely privately held companies, you will not be able to get information on their revenue levels. However, you can get information on what funding round they are at and how much they have raised.

If they have raised a B round for example they are probably pretty far along on their growth path. You can get information on how much they have raised, when and from who on Crunchbase.

Here is a great resource guide we have prepared to help you with analyzing your competition.