<![CDATA[The development of national spirit character is an essential aspect of education in strengthening students' nationalistic attitudes amid ongoing social and cultural changes. This study aims to analyze the influence of national spirit character development on the nationalistic attitudes of Grade XI-3 students at SMA Swasta Kemala Bhayangkari Rantauprapat. A quantitative approach with a correlational design was employed using simple linear regression analysis. The sample consisted of 29 students from Grade XI-3, drawn from the population of all Grade XI students. Data were collected through a Likert-scale questionnaire and analyzed using SPSS version 22. The findings revealed that national spirit character development had a positive and statistically significant relationship with students' nationalistic attitudes, with a regression coefficient of 0.716, a t-value of 6.322, and a significance level below 0.001. The coefficient of determination indicated that national spirit character development explained 57.1% of the variation in students' nationalistic attitudes. These findings highlight the importance of strengthening character education through classroom learning, teacher role modeling, and school activities to foster national awareness, patriotism, and civic responsibility among students.]]>
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