Help understand loops

[tonycstech]

from tkinter import messagebox
from threading import Thread

def Loop1():
    while 1:
        messagebox.showinfo("Title", "1")
def Loop2():
    while 1:
        messagebox.showinfo("Title", "2")

process1 = Thread(target=Loop1)
process2 = Thread(target=Loop2)
process1.start()
process2.start()

I should be getting 2 messages popped but i only see one constantly.
Second message does not trigger because its stuck in a loop 1

I understand that loop 1 prevents loop 2 to start until its broken but isnt what Threading was for ?
Why i dont get two message boxes at same time ?
It seems to work with print but not with message box.
Thank you.