are more occurrences or that those occurrences are more powerful.
https://www.nhc.noaa.gov/pastdec.shtml
According to NOAA the US has averaged 6 major hurricanes per decade since they started tracking around the civil war. The 60's were the last decade where we met that average.
Hurricans are NOT getting more frequent and powerful. If anything they are less frequent and less powerful in the last few decades.