This is a very interesting phenomenon considering the anti-Islamic sentiment in much of America. I would suggest the following.
1. The ability to develop a halal line of food is probably not too challenging when one considers that much of the laws about whether something is halal are paralleled in the Kosher food business. This means food is already available to designate as Halal also.
2. Anti-Islamic sentiment does not mean that Americans will abrogate the freedom of religion of Muslims when it comes to those things which do not impact negatively on society. In other words, we don’t support mosques being built when seemingly anti-American, but we can support the dietary needs of Muslims.