Loop over to create new variables from uniform dataframe

My problem is the following

I want to create variables e_1, e_2, e_3, ... , e_50 which are all composed of 100 draws from the uniform[-1,1]

This means e_1 is a vector of 100 draws from U[-1.1], e_2, .., e_50 as well.

Here is what I thought I could do :

periods <- c(1:50)
people <- c(1:100)
for (t in periods){
sprint('e_', t) <- runif(100, -1,1)
}

This did not work, and i am really not sure how to change it to obtain what I want.

Thank you so much for your help!!