Q.i cannot seem to keep anything alive
I Live in Las Vegas, NV and just planted some Lantana. It’s been about a week and a half and it looked great at first then all of a sudden there are no flowers and it looks like it had just died. What am I doing wrong? I cannot seem to keep anything alive here.

Watering is very important in warm temperatures, new planting are very vulnerable.
Here are a couple of great articles that will help.
https://www.gardeningknowhow.com/ornamental/flowers/lantana/lantana-plants.htm
https://www.gardeningknowhow.com/plant-problems/environmental/heat-stress-plants.htm