Jewish emigration from Morocco was on a small scale before 1945. Moroccan Jews did so for better political, social and economic conditions, particularly after 1912 when Morocco came under colonial rule (although the Islamic administration continued to function.)

It was the Zionist movement that fomented the large-scale emigration to Israel. Read: Haaretz

'We Saw Jews With Hearts Like Germans': Moroccan Immigrants in Israel Warned Families Not to Follow

Thousands of letters written in the early years of the state by immigrant soldiers to their families in Morocco reveal a gloomy picture. Most wanted to go home: https://www.haaretz.com/israel-news/2021-07-10/ty-article-magazine/.highlight/horrified-by-racism-moroccan-immigrants-in-israel-warned-families-not-to-follow/0000017f-e683-df2c-a1ff-fed3ce450000