This Arabic as a Foreign Language (AFL) is considered a parsimonious field in applied linguistics. Therefore, this article tries to highlight how language transfer influences American students in their Arabic learning process. Additionally, this work attempts to explore whether Arabic foreign learners rely on their pre-existing knowledge to learn Arabic and determine the role of transfer regarding language universals. The study employs a quantitative methodology based on a Grammaticality Judgment Task (GJT) to achieve its objective. According to the study's results, L2 Arabic learners initially transfer their L1 setting to L2. In other words, Universal Grammar (UG) exists, but learners only have indirect access to it via their L1. By studying and investigating the influence of language transfer on learning outcomes, experts' and educators’ interventions can be tailored to more effectively assist foreign students in overcoming errors connected to their first language and improving their proficiency in learning Arabic language.