The limitations of teachers applying educational value in accordance with this learning model are suspected to cause low nationalism, which is 56.25% or 18 of 32 students. Researchers use learning models based on problems as solutions to problems. The purpose of this research is 1) to improve the implementation of the PBL model in PKn-Learning to increase nationalism for students in grade IV-A SDN Simomulyo III 2020/2021, 2) to increase and to know the increase of nationalism in learning with the LBL model for students. Research is PTK, consisting of two cycles. The subject of this study is class IV students. Data collection techniques using questionnaire deployment, as well as observations and interviews as supporters. Based on the research results can be concluded that the implementation of the PBL model can increase 43.75% of the nasonalism of the class students. The increase can be seen from the percentage of the number of students who have attitude criteria, ranging from the initial condition of 56.25%, Cycle I is 93.75%, and cycle II is 100%. Improvements can be seen from the average student value. The initial condition is 74.87, my cycle is 87.62 and cycle II 87.66

Keywords : Nationalism Attitude, Learning-Based Questions