A Florida man has been sentenced to 20 years in prison for attempting to support the Islamic State terrorist group by posting a video online for making explosives. Romeo Xavier Langhorne, 32, was sentenced Thursday in Jacksonville federal court, according to court records. He pleaded guilty last year to one count of attempting to provide material support to a terrorist organization. Langhorne has been a follower of the Islamic State group since 2014, according to a criminal complaint. Investigators said Langhorne was living in St. Augustine, Florida, in February 2019 when he began communicatin…