The right, the right shall you follow, so that you may live and have possession of the Land which God your God gives you. (Deuteronomy 16:20)

That you may live, and you possess the Land: The appointment of fitting judges is sufficient merit to keep Israel alive and settled in their Land. (Rashi, based on Sifrei)
(Note that the translation above, taken from the English translation of Rabbi Shimshon Raphael Hirsch's German commentary, differs from the standard translation "Justice, justice shall you pursue" and reads "The right, the right you shall follow.")
Rabbi Hirsch offers a deeper understanding of the connection between pursuit of justice/the right and Israel's possessing the Promised Land, writing:
Israel's sole task is to pursue justice and that which is right forming all private and public matters in accordance with God's Torah. Israel must pursue this goal unceasingly and with all devotion. "So that you may live and have possession of the Land which God your God gives you " – with the pursuit of justice/the right, Israel has done everything to secure its physical and political existence.
Beyond this, the connection between pursuit of justice/the right and Israel's control of the Land is ongoing and perpetual, not simply a one-time matter: Inasmuch as here the political security of the Land to be achieved by acknowledging and caring for right and justice is called "possession," even after possession of the Land has been completed – and the text is obviously speaking of such a time – the significant truth is thereby laid down that the possession of the Land comes into question every minute, and it has to be taken into possession afresh every minute by the Jewish state as a whole paying acknowledging tribute to right and justice, and realizing this in the Land.
The Torah teaches that the Nation of Israel may not be complacent within its Land, but at every moment, we are obligated to be vigilant and guarantee the application of justice/the right within our Land, for if not so, we jeopardize our future within our Land, the Holy Land (David Magence)

Shabbat Shalom
The Va’ad