Dodge Dakota 1999 is running a 210 temp.Help?

Okay my 99 Dodge Dakota Sport has been running a 210 temp..I am no mechanic so dont know whats wrong. I changed the thermostat yesterday and it still got up to 210 today. It gets hot mostly when Im on the road and drops a little when Im idling. Any suggestions would be greatly appreciated. Thanks
Update: I did flush out the radiator before changing the thermostat and it used to not run at 210, just recently
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