ggmap and spatial data plotting issue - r

Question

I am trying to update some old code that I inherited from before the Google API days to do a fairly simple (I think) plot.
By the time I get to the plot, my data consists of 50 triplets of latitude, longitude, and $K amount of investment at that location.
head(investData)
amount latitude longitude
1 1404 42.45909 -71.27556
2 1 42.29076 -71.35368
3 25 42.34700 -71.10215
4 1 40.04492 -74.58916
5 15 43.16431 -75.51130
at this point I use the following
register_google(key = "###myKey###") #my actual key here
USAmap <- qmap("USA",zoom=4)
USAmap + geom_point(data=investData, aes(x=investData$longitude, y=investData$latitude,size=investData$amount))
I've been fighting all ay with establishing accounts and enabling APIs with Google, so it's entirely possible I've simply failed to enable something I need to. I have the geocoding, geolocation, and maps static APIs enabled.
I get the following output at the console
Source : https://maps.googleapis.com/maps/api/staticmap?center=USA&zoom=4&size=640x640&scale=2&maptype=terrain&language=en-EN&key=xxx
Source : https://maps.googleapis.com/maps/api/geocode/json?address=USA&key=xxx
But I get no plot.
if I simply run
qmap("USA", zoom=4)
I get the map I expect. But when I try to overlay the investment data I get zilch. I'm told by the folks who handed this to me that it worked in 2017...
Any idea where I'm going wrong?

Answer 1

If you are running your script via the source function or with the run command (from inside RStudio) you must explicitly call the print function on your ggplot commands. For example:
print(USAmap + geom_point(data=investData, aes(x=longitude, y=latitude,size=amount)))
As Camille mentioned, no need for the $ inside the aes