This study aims to determine the relationship of understanding Indonesian history with the nationalism attitude of students of State Senior High Schools in Ngaglik District, Yogyakarta. This research is a type of correlational research that uses a quantitative approach. The research sample were 126 students, data collection using tests and questionnaires. Tests are used to reveal data about understanding Indonesian history, while questionnaires are used to reveal nationalism. The validity test of the instrument uses biserial point correlation and reliability test using the KR 20 formula. The data analysis technique uses quantitative descriptive analysis. Analysis prerequisite test includes normality test and linearity test. The hypothesis test uses Pearson product moment correlation. The results showed that there was a positive and significant correlation between the understanding of Indonesian history and the nationalism attitude of the students of State Senior High Schools in Ngaglik District, Yogyakarta. It shows that the rcalculation is 0.447> rtable 0.176 with a significance level of 0.000 <0.05. Thus, the higher the understanding of Indonesian history, the higher the nationalism of students.

The purpose of this study is to find the values of character education by using material of the Struggle of K.H Gholib in defending Indonesian Independence at the Lampung Residency. The method used is descriptive qualitative research method with library research. The results of this study are briefly elaborated on the biography and struggle of K.H Gholib as a local figure who fought to defend Indonesia's independence at the Lampung Residency. Then the values of character education contained in the material include: religious attitudes, hard work, curiosity, love for the country, nationalism and communicative. These character values can be actualized by students in learning local history in high school. The hope is that students can emulate the figure of a figure from K.H Gholib, especially for those who live in the area of Lampung and apply it to their lives both now and in the future.